noActivity | noMember | bPresent
AC-100     | 3100     | V
AC-101     | 3101     | V
AC-100     | 3102     | V
AC-102     | 3103     | V
AC-100     | 3104     | F

output voulu:
noActivity | noParticipants
AC-100     | 3
AC-101     | 1
AC-102     | 1